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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Dorsal view of a Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Report at a Glance

General RegionRiver Road
Specific LocationRR Trestle to 1/2 mile downstream
Dates FishedFriday April 11
Time of Day10:30 - 3:30
Fish CaughtTen midgets 8" - 10", two about 12", two pretty wild fish > 7". two chubs
Conditions & HatchesWater clear and seemingly quite warm. Thermometer broken but water felt to be mid 60's - ya think that is possible? Good flow and nice nymphing depth. Hardly any Hendrikson's - saw 1/2 a dozen early then none for rest of day. Some Grannoms and also tan caddis. Once in awhile there would be a rise but for the amount of sun and caddis there was very little surface action.

Details and Discussion

Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Apr 12, 2008April 12th, 2008, 7:32 am EDT
Two larger fish on top, all others on mymphs, either a #14 BH PT or a #16 olive caddis with a gray ostrich herl thorax and lemon woodduck downwing.

It's a shame such pretty water and so few mayflies and rising fish.
Catskill fly fisher for fifty-five years.
Lancaster County ,Pa.

Posts: 4
Backwodzboy on May 11, 2008May 11th, 2008, 1:16 pm EDT
last time i was over caught 35 fish. most on neon green salmon egg size 12 hook. one nice 22 inch rainbow on this green egg. also try an olive or green scud size 12 to 16. area fished: "The Run" behind boiling springs
lookin for the big ones! (practice catch & release)
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on May 11, 2008May 11th, 2008, 3:29 pm EDT
Didja break their necks and put'em on ur stringer?
Catskill fly fisher for fifty-five years.

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